Method of producing artist&#39;s material



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METHOD OF PRODUCING ARTISTS MATERIAL Filed May 26, 1951 FIG. 1

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IN VEN TOR.

A TTORNEY6.

Patented May 12, 1936 UNITED STATES PATENT OFFICE METHOD OF PRODUCING ARTISTS MATERIAL Application May 26, 1931, Serial No. 540,029

6 Claims.

My invention relates to material that is adapted for the use of artists to quickly provide (in sharply contrasted black and white) shading. background, etc., in drawings from which zinc etchings or printing plates are to be made; simplifying the work of the artist in making any desired shaded design in a drawing, and simplifying the process of producing such design on a printing plate, with more positive results and at less expense than by methods now commonly used. The shading, background or the like, which has been previously prepared, is preferably subdued and capable of being brought out by the artist in the desired parts of the drawing.

' This invention also relates to the method of producing said material for the use of artists.

Important objects of the invention are: (1) More satisfactory results from placing the patterns, designs, shading, background, etc., upon the drawing instead of upon the printing plates during the process of their manufacture. (2) To obtain the truest of contrasts, in black and white, with no stains between the dotsor lines of the desired pattern. (3) To appreciably lessen the work of the artist. (4) To obtain more positive results with greater speed and at less expense,

in transferring said design from the artists drawing to the printing'plate, by facilitating the preparation of the plate. (5) To provide said artists material, adapted to the use of pencil, ink or crayon, on which drawings can be made, stored, and held indefinitely without fading or damaging Another object of the invention is to eliminate the use of all chemicals that are harmful to the user of the material, and eliminate such in the production of the material.

Further objects reside in details of the finished product and in novel steps employed in the method used for production of same, which will appear in the course of the following description. 7 E

In the drawing like reference characters designate similar parts in the several views. Figure 1 is a face view of a sheet of paper embodying features of the present invention.

Figures 2, 3 and 4 are exaggerated, broken, sectional views taken on the line 2-2 of Figure 1, illustrating various steps in the method of 50 producing my material. 7

Figures 5 and 6 illustrate the use of the finished product, which will be explained more fully hereinafter.

Referring more in detail to the drawing, the reference character I designates a sheet of paper stipple, drawing or photograph of scene, portrait, 10

sketch, wash-drawing, or design produced in line etching or in half-tone reproduction, etc. The printing is preferably done with a sticky, ummy or adhesive substance forming a protective coveri suitable, but preferably a quick-drying, dense and heavy printers ink is employed.

Assuming that the plate from which the paper is printed carries a design of dots, as shown in 1 Figure 1, then the dots will be reproduced as shown in said figure. The ink providing the dots is illustrated at 9. The ink is then allowed to dry sufiiciently, in order to provide protective films for the parts of the sensitized face that are covered by the dots. It is preferred not to allow 25 the ink to harden, but only dry to a limited extent.

The next step in the process is to remove the chemically developable material in spaces I0 between the dots. This is preferably done by applying to exposed parts of the film, by immersion, painting, or otherwise, a solvent of silver chloride, silver bromide or silver iodide, such as a solution of sodium thiosulphate, or what is known in the art as hypo. thirty seconds in a fifty per, cent (50%) solution of sodium thiosulphate is usually a sufficient length of time. Of course different strengths of solution and different grades of paper take different periods of time. The sheet then merely car- 40 ries dots ll of sensitive material, each dot 9 being protected by the dot of ink superimposed thereon, as exemplified by Figure 3.

The solvent is then washed off with water, as by placing the sheet in a pan of clear water for from five (5) to fifteen (15) minutes (ten minutes being a fair average). The water must be free from sodium thiosulphate. Running water is desirable, especially in a stream or spray, or in a pan or tray containing running water, in order that no trace of sodium thiosulphate may remain in the water.

The next step is to wash off the ink. This may be done by wiping the sheet with wet cotton. Of course any well-known ink solvent may be used,

Ordinary printers ink has been found If immersed, 35'

above described process The drawing may either be in pencil or crayon (to be inked in later) or in chemical-proof ink. The artist then applies any suitable developer to that portion l3 of the sketch where he desires to bring out the design.. Surplus developer may be removed by blotting The dots l3 arein practiceno larger than the remaining dots on'thesheet,'but': have been exaggerated in the drawing to indi-' cate that they are of darker color. Thereare a or otherwise.

number of good, well-known developers on the market, which may be used to bring out and make permanent the. portionof thedesign that isdesired.

The remaining dots M on the sheet I may now be removed with'any suitable solvent, as described hereinbefore,such'as sodium thiosulphate, which also removes'any 'developer'stains; which, in time, might appearbetweendots."

The developer, in the process of bringing. out

the. dots toformthe desired design, maybe ap- 30. .plied by'brush, orangewood stick, or otherwise.

Theiisheet maybe immersed in'or brushedwithv the'solvent ill".th8 last step; since the dots l3 have already'been'set by the developer. The surplus-solvent is preferably removed, as with a blotter;

After following the foregoingsteps, the product' will haveuthe design l3'in thee-desired parts of the drawing'and the space 15 around'the drawing will be white. If the artist merely penciled 40,,his sketch at first, he mayjink'it inv afterthe paper is dry;

Itis'thought clear that anydesignmay be employed; As an example, white dots in'a black background may be used.

made in the details of the method and product without departing from the-spirit and scope of the invention.

-W-hat I claim and desire'to secure by Letters .Patent is:-

1. A process of producing a positive chemically developablesurface-for the use'of artists, consisting inprin'ting upon a layer of "chemically developable silver emulsion, soluble in sodium thiosulphate; a" pattern that will protect the layer against the action of sodium thiosulphate, then subjecting the layer'to 'a solution of sodium thiosulphate to remove the unprotected'silver emulsion andthen removing theprotective-pattern to produce a'chemically developable design.

2." A process of producing a positive chemically:

It"is'--to be understood-that changes-'may'be developable surface for the use of artists, consisting in printing upon a silver halide emulsion layer, a pattern that will protect the layer against the action of sodium thiosulphate, then subjecting the layer to a solution of sodium thiosulphate to remove the unprotected silver halide, and then removing the protective pattern to produce a chemically developable design.

3.- A process of producing a drawing or design for making printing plates, consisting in printing upon a silver halide emulsion layer, a pattern that will protect the layer against the action of sodium thiosulphate, then subjecting the layer to a solution of sodium thiosulphate to remove the unprotected silverihalide, and then removing the protective pattern to produce a chemically developable design, then producing upon the design, a drawing orthe like, then developing the portion of the surface, corresponding with said drawing or the like, and finally subjecting the design to theaction of a solvent capable of removing the part of the design other than the developed portion.

4. Aprocess of producing a drawing'or design.

for making printingplates, consisting in printing upon a silver halide emulsion layer, a pattern thatwill protect the layer against the action of sodium thiosulphate,-then subjecting the layer to a solution of sodium thiosulphate to remove the unprotected silver halide, and then removing the protective pattern to produce a chemically developable design, then developing a portion of the. design, and finally subjecting design to the action of a silver halide solvent.

5. A'process of producing a drawing or design for making printing. plates, consisting in printinga pattern upon a-sheet of material coated with a silver halide emulsion layer, with a substance impervious to sodium thiosulphate, exposing the coated surface to the action of sodium thiosul-' phate, to thereby remove the exposed silver halide,

removing the impervious substance from the pattern, applying a pictorial representation to the patterned surface of the sheet, developing porhalide, removing the impervious substance from.

the pattern, applying a pictorial representation to the patterned surface .of the sheet, developingportions of the pattern within the pictorial representation, and applying sodium thiosulphate to the processed surface of the sheet.

WILLIAM HEADER. 

